React-native get all photos from Camera Roll and Camera Roll API

I am trying to get camera roll photos using react native CameraRoll.getPhotos API. The issue I found that the documentation is not great. In react-native official documentation there are two terms that were mentioned

{
first: ..., // (required) The number of photos wanted in reverse order of the photo application
after: ..., // A cursor returned from a previous call to 'getPhotos'
groupTypes: ..., // Specifies which group types to filter the results to
// One of ['Album', 'All', 'Event', 'Faces', 'Library', 'PhotoStream', 'SavedPhotos'(default)]
groupName: ..., // Specifies filter on group names, like 'Recent Photos' or custom album titles
assetType: ... // Specifies filter on assetType
// One of ['All', 'Videos', 'Photos'(default)]
}

According to these it always require a parameter first which dictates how many pictures we can get from CameraRoll. Instead if I want all the photos from camera roll how can I get it?